Show the subdirectory where a VCS operation failed 

Fix pep8 CI build.

Tested locally:
=====================================================
================== Running pep8 =====================

Searching for pep8
Reading http://pypi.python.org/simple/pep8/
Reading http://github.com/cburroughs/pep8.py/tree/master
Reading http://github.com/jcrocholl/pep8
Best match: pep8 0.6.1
Processing pep8-0.6.1-py2.7.egg
pep8 0.6.1 is already the active version in easy-install.pth
Installing pep8 script to
/Users/pnasrat/Development/pip/pip_virtualenv/bin

Using
/Users/pnasrat/Development/pip/pip_virtualenv/lib/python2.7/site-packages/pep8-0.6.1-py2.7.egg
Processing dependencies for pep8
Finished processing dependencies for pep8

==================== Ended pep8 =====================
=====================================================

raise awareness of 'user scheme' and 'PYTHONUSERBASE'

update to use pip's --user option; link to python.org docs for site.USER_BASE, and removed the editorial about the use case.

Fix transposed issue numbers in news.txt - thanks pjdelport!

Update news to reflect the forward passage of time.

Adding documentation about the `extras_require` option

Adding documentation about the `extras_require` option for selecting additional dependencies. See: Issue #7

pip/download.py: use proxy for https

Signed-off-by: NRoss Brattain <ross.b.brattain@intel.com>

Fix broken link to "requirements file format"

Addressed pypa/pip#135.

gh-406 - improper relative urls resolution

Instead of a source file it downloads a binary macosx .zip file
which contains a binary installer.